For this limited data set (house price data is only available since 1987) the YoY changes move somewhat together, although house prices started declining before PCE during the current economic downturn. This difference in timing could be because of homeowners withdrawing equity from their homes (the Home ATM) even after prices first started falling. However the recent MEW data shows that the Home ATM is closed and consumption has declined sharply.

This doesn't tell us how much further real PCE will decline on a YoY basis - my initial guess was 4%, but it might be less.